indefatigable

adj.
Incapable or seemingly incapable of being fatigued; tireless. See synonyms at tireless.

[Obsolete French indéfatigable, from Latin indēfatīgābilis : in-, not; see in-¹ + dēfatīgāre, to tire out (dē-, intensive pref.; see de- + fatīgāre, to weary).]

indefatigability in'de·fat'i·ga·bil'i·ty or in'de·fat'i·ga·ble·ness n.
indefatigably in'de·fat'i·ga·bly adv.

adjective

Having or showing a capacity for protracted effort, regardless of difficulty or frustration: inexhaustible, tireless, unfailing, unflagging, untiring, unwearied, weariless. See continue/stop/pause, tired/fresh.

adj

Definition: untiring
Antonyms: fatigued, feeble, idle, tired, weary

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IN BRIEF: Untiring.

The optimism of a healthy mind is indefatigable. — Margery Allingham (1904-1966), English detective story writer.

Dansk (Danish)
adj. - utrættelig

Nederlands (Dutch)
onvermoeibaar, onverdroten

Français (French)
adj. - inlassable, infatigable

Deutsch (German)
adj. - unermüdlich

Ελληνική (Greek)
adj. - άοκνος, ακούραστος, ακαταπόνητος

Italiano (Italian)
instancabile

Português (Portuguese)
adj. - incansável

Русский (Russian)
неутомимый

Español (Spanish)
adj. - infatigable, incansable

Svenska (Swedish)
adj. - outtröttlig, oförtruten

中文（简体）(Chinese (Simplified))
不知疲倦的, 不屈不挠的, 有耐性的

中文（繁體）(Chinese (Traditional))
adj. - 不知疲倦的, 不屈不撓的, 有耐性的

한국어 (Korean)
adj. - 지칠 줄 모르는, 불굴의

日本語 (Japanese)
adj. - 疲れを知らない, 疲れない

العربيه (Arabic)
‏(صفه) لا يتعب‏

עברית (Hebrew)
adj. - ‮שאינו מתעייף‬

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